Coupled multielectrode array sensors1-5(CMAS) with multielectrode corrosion
analyzer and temperature monitoring capability were used along with an Isfet type pH
probe, a process contact conductivity probe, and dissolved oxygen probe to monitor data
over one year in an Alcoa rolling mill coolant system. During this time several excursions
of various parameters occurred, indicating chemical and possible electrical causes of
corrosion. A CMAS type crevice type probe was also used to investigate crevice
corrosion (a common problem on piping and fixtures coming in external contact with the
mill coolant) and was used to determine material/engineering recommendations for
prevention of corrosion in rolling mills.